Mitering machine



March 20, 192.8. a

G, O. EDWARDS ET AL MITERING MACHINE Filed April- 4; 1925 a sham-sheet 1 J 3.11 2...: .w. o

March 20, 1928.

1,663,247 G. o. EDWARDS ET Al.

MITERING MACHINE :s sheets-sheet 2 Filed Avril 4, 1925 March "2o, '1928.

der Eran/ri'.

3 Sheets-Sheet 3 G. O. EDWARDS ET Al.

MITERING MACHINE Filed April 4. 1925 Patented Mar. 20, 1928.

unirse STATES, Partnr ori-2ies,V

GEORGE OPIE EDWARDS ANDr LEVANDER BROWNQJB, OFMONTREALXQUEBEC,

MITERING MACHINE Application filed April 4, 19252 SerialV No;v 20,582.

The object of the present invention is to provide a mitering machine for use particularly by picture framers although adapted for general use in cabinet making and joinery with which inorerapid and accurate work can be accomplished and With greater ease than has been possible 'with machines of this type heretofore in use.

A further object is to provide a machine having the foregoing characteristics, Which is of simplified construction and Which can be manufactured at a comparatively loW cost.

To this end the invention consists of the combination, construction and particular arrangement of the parts hereinafter described and illustrated and pointed out in the claims.

For full comprehension however, of our invention, reference must be had to the accompanying drawings in vwhich similar refercnce characters indicate the same parts, and wherein:

Figure 1 is a front' eleva-tion of' a miter ing machine constructed according to our invention v Figure 2 is a plan view' thereof;

Figure 3 is aV side elevation thereof;

Figure 4 is a sectional view taken on line an article to be sawn in position on the Work i support Figure la is a sectional View taken on line 1li-let Figure 2;

Figures 15and 16 are detail viewsv ofthe upper ends of theouter saw guides on the y carriage;

Figure 17 is a detail View ofthe carriage holding pin; and

Figure 18 is a detail vievvof the means for y adjustably fasteningl'the end of the saW blade opposite to that illustratcd'in Figures 8, 9. and l0.

The-machine 'illustrated in theY accompanyiing' drawings constitutes the; preferred emv bodiinent of our invention. 4

- Briefly stated it consists of* a sa-W table or- Work support 2an adjustable carriage? 3 rotatable on aL vertical airisas ati 4- upon thel table; a boW saW- 5Lv mounted uponfthe carriage and movablein unison therewith and relativelyv thereto, adjustable means for clamping: the Work in' position upon the top ofthe tabl-e, adjustable measuring meansifor determining the lengt-hV ofv the articles to y be sawn, means for holding? the carriagev in the various positions lto which it may; be adjusted; and meansv for supporting theV saw positions raised above thefcutting posiion. i

Thesaw tabley or Work suppor-tQ consists ofl a unitary. casting`l having a flat top 6 with aV quadrantall openingj 7k therein mid- Way betweenl its ends to accommodate the saw` which in the present embodiment has i a range ofE movement' covering anarcg'of 900; the angular sides 8- and 9=ofl the opening Abeing disposed at an angle ofl 4'5"j to themiddle transverse vert-ical planeioff the.` table so that it is possible toV operatethe v saw at any angle up to 45 on each side of tlie'transverse medianv line of the# table. TheI area of'tletopor Worksupportingsul:- face ofthe table maybe varied'to meetrequ1rements-;-butfor picture framingA Work and the like. when it is necessary to' support comparatively. long pieces of moulding it is preferable to-.provide the table with'extensurface of the latter coincidingl with the top of; tliet'able.

rIlhe articles tobesawn are alignedl upon the tabley against a' backstop or abutment 125coiistitut`ed by a rib project-ing upwardly above the top ofthe table and extending alongthe rear side-thereof, and thelengthv of each pieceto be saWn isr'deter-mi'ned" by an adjustable stop 13the latter consisting of affl'at metal str-ip which isclamped inthe adjusted positionI by. clamping member 14 embracing the top of the extension 11 and slidable thereon; and' al set screw 15.v

The adjustable meanslfor securing the Workuponthe tablein thep'osition invvhich it is to be sawn consists of: clamping inem` bers 16 and 17 locatedupon the tabl'evatl opposite, sides of the quadrantal opening-` and movable i'diagonally relatively to tlieg'abutlos l ment12 in' slots 19 and 2O .disposed parallel j to the angular sides of the opening. `This movement is effected by feed-screws 21 and 22 rotatably mounted in the table beneath the' top, nuts 23-'and 24 movable axially on the feed-screws and connected to the members by studs 231 and 24:L extending upwardly through the slots and formed integrally with the nuts, andv handles 25 ,mounted upon the front ends ofthe feedscrewsby which the latter may be'manually rotated. i,

n The saw carriage 3 by means of which the saw is adjusted to the angle at which it is desired to make the cut comprises a unitary casting pivoted adjacent its rear end upon a ybase 26 thereofcwhich is curved concentri- The carriage callytothe axisof the pin. has a rangeofmovement covering an arc of 90and the'table is constructed to present a clear space 27 accommodating the movement. AIn order to provide adjustable means ,for stopping the carriage at the exact lines yof the 45 angles abutments constituted by bolts 28 and 29 are mounted in the table at each end of the track and locked in their adjusted positions by nuts 29, the heads of the bolts extending inwardly towards the carriage and presenting abutment faces. 30. The means for securing the carriage 1n any position to which it may be adjusted Yconsistsof a member 3l forming an integral part of the front of the table top and o'set Abelow the level thereof to provide'clearance forthe saw blade. It is curvedconcentrically tothe axis of the carriage and is located directly over the front portion thereof y and. provided with a groove 32 in its underside in the bottom of which are a series of l'spaced sockets 33; These sockets are adapted to snugly receive the tapered upper end Y Vcfa pin 34 slidablymounted in vertical'posi- `tion in a socket 35m the carriagethevpin projecting above thetop of the latter and vhaving a ytendency to enter the sockets imparted to it by aspiral spring 36 located Withinthe socket 35 and bearing between the bottom thereof and the pin, the lower end of the latter being chambered as at 34a Vto vreceive the upper portion of the spring.

The snug `fit of .the pin in the socket and the chamberedrlower end of the pin which tends to maintain the latter in its proper verticalY alignment in the' socket35 reduce lateral playf tol a -minimum and make it possible foto obtain a precise adjustment. j

' Injorder to provide means for releasing the carriage when it isidesired tochange the `1 `angular position of the. saw, studs 40 on oppositesides of the pin34 are extended laterally through vertical slots 4l in the wall of socket 35 in the carriage and a releasing lever 42 having a forked end 43 is fulcrumed upon the carriage as at 431 in position with its fork straddling the front end of the latter and pivotally connected to the studs', the arms of the. fork'having slots 44 to receive the studs and permit of relative movement between the lever and pin. Y

The bow saw 5 comprises aA unitary frame of inverted U-form and a saw blade carried thereby. The frame consists of front and back vertical end members 5()a and 501 respectively, preferably of tubular cross-section7 united at their upper ends bya horizontal top member 50e also of tubular crosssection and formed integrally therewith, and a horizontal centre bar 50d extending between and having its ends connected to the end members and adapted to act as an adjustable strut therebetween for placing the saw blade under tension, the latter beingV stretched between land carried by the lower ends of theend frame members.

In order to effect adjustment of the intermediate strut member each end is connected to the end frame members by a threaded swivel pin 50e and a sleeve nut 50f7 leach swivel pin having a forked end straddling the adjacent end member and being pivot- Vally connected thereto as at 50g, and its nut being inserted into the adjacent end of the tubularA centre bar, and having a peripheral flange formingan abutnicntr for the centre bar, so that by axial adjustment of each nut on its swivel pin the pressure on the end members may be varied to secure the desired tensionv on the saw blade. A handle 50h is l cu fitted directly around the front end member.V s

The saw blade consists of a thin steel member provided with iine teeth and having its ends so mounted in the end frame members that its cutting edge may be adjusted relatively to the saw table and to the saw frame. In addition to this adjustability the mount of the blade also permits of tension being exerted on the blade independently .of the centre bar. The means for effecting these adjustmentsconsists of slits 51 and 52 -in the lower ends of the 4end frame member and adapted to receive the ends of the saw blade; a series of transverse bolt holes in the slotted end of each end frame member and indicated respectively at 53 and 54; a series of boltholes in each end of the saw blade indicated at 55 and 56 respectively;V a transverse bolt- 57 passed through one of the holes in each of the series 53 and 55 and adapted to secure the adjacent end of the :Saw blade in the front end member, and a `tension bolt 59 passedthrough one of the holes of the series 54 in the rear end membei', Aand having its inner end split to receive the adjacent end of the saw blade and being connected thereto by a bolt 60 passed through one of the bolt-holes of thev series 56, the outer end of the tension boltprotruding beyond the frame and being threaded to receive a tightening nut 61. The series of bolt holes in each end frame member are so spaced relatively tothe series of holes in the saw blade that slight vertical adjustment of the blade within the frame brings one o-r more of the holes in the blade into alignment with the holes in the frame, so that when it is desired to adjust the blade in the frame the securing bolts are first removed, the blade shifted to thek desired position, and the bolts replaced.

This construction and arrangement of parts provides a combined means for securing the blade in thev frame, for placing it under tension, and for adjusting the blade relatively to its carrying frame and consequently the saw table.

Additional and independent adjustment of the saw relatively to the saw table is also provided by the means for mounting the saw upon the carriage, and for guiding it in its movement relatively to the saw table. This last mentioned means consists of a pair of spaced vertical inner guides 64 of solid cross-section although not essentially so, located one at each end of the carriage and projecting upwardly therefrom, and a second pair of guides 65 encircling the firstnientioned pair and in telescopic relation therewith, the guides of both pairs having vertical slots 66 and 67 respectively tov receive the saw blade, t-he slots 66 in the inner guides being slightly wider than the slots 67 in the outer guides. The upper ends of the outer sleeve guides terminate in collars 68 which loosely encircle the longitudinal centre bar 570d of the saw frame. These collars are adjustably clamped on the ends of the guides as at 69 and having vertically spaced anti-friction rollers 70 and 71 rotatably mounted therein, the rollers being located above and below the centre bar 50d and spaced a suicient distance apart to enable either end of the saw to be canted upwardly or raised to position clear of the work upon the `table.

The saw may be supported in either posivtion by rests 75 and 7 6 mounted upon front and rear ends of the carriage, each rest consisting of two relatively adjustable parts 77 and 78 one consisting of an internally threaded member which is hinged upon the carriage in position directly beneath the saw blade and the other consisting of an adjustable extension in the form of a bolt which is screwed into the member, the bolt having a head of a comparatively soft material for engagement with the saw blade.

The foregoing construction and arrangement lof parts provides a mitering machine with which work of great precision can be accomplishedboth with rapidity and ease, the construction permitting the useof .a thinner and narrower saw blade than has been heretofore employed in machines of this type, and consequently making it pos- When it is desired to saw a length of Apicture molding say at an angle. of 150, the molding is placed upon the `table in position beneath the saw and aligned againstthe back stop or abutment 12 with the right hand end of the molding in bearing relationship with the measuring stop 13 which has been previously adjusted. The molding .is then clamped in this position by. rotating the handles 25 in a` direction in which the clamping members 16 and 17 will be fed into engagement with the molding. The carriage is then released if not .in the 15" position and swung thereto following which the saw may be lowered to its cutting position and operated in the usualinannei.

iVhat we claim is as follows 1. A mitering machine consisting of -a work support, a carriage adjustably mounted upon the work support, a pair of posts rigidly mounted upon the carriage and located one at eachend thereof and projecting upwardly therefrom, said posts being slotted from their upper ends downwardly to within close proximity of the carriage and the upper ends of the slots being open to allow the saw to be lifted 0H at will, and a saw. unit consisting of a frame having a horizontal member, a blade mounted in the frame in parallelism with the member, and sleeve guides suspended from the said member and having slotsthrough which said blade passes, said unit being adapted to'be mounted upon the carriage with the sleeve guides enclosing the posts and with the saw blade passing through the slots therein the unit being instantly removable from the carriage as a whole.

2. A mitering machine consisting of a work support, a carriage adjustably mounted upon the work support, a saw blade and means for mounting the blade upon the carria-ge, said means consisting of a pair of vertical posts rigidly mounted upon the carriage and located one at each end thereof and projecting upwardly therefrom, said posts being slotted downwardly from their upper ends to receive the said saw blade, the upper ends of the slots being open to allow thesaw to be liftedv off at will, and a guide sleeve encasing each post and in telescopic relation therewith, said sleeves having slots *aligned with the slots in the posts.

3. In a mitering machine a work support; a carriage rotatably mounted upon the Work support, a saw mounted upon the carriage and rotatable in unison therewith and capable of being raised and lowered upon the carriage, and adjustable means or supporting the saw in its raised position, said lastmentioned means consisting of a rest hinged upon the carriage in vertical alignment with the saw blade and adapted to assume horizontal and vertical positions.

4. A saw carriage consisting ot an integral casting and having pivotal means for being rotated horizontally on a work support, and adapted to have its travelling end supported by a track; sockets for vertically holding saw guides; a socket, and slots for accommodating. and guiding a vertically movable pin for holding the carriage immovable on the Work support; means for attaching a lever to operate the holding pin, and means tor attaching a support for holding the saw in a raised position. f 1

5. In a mitering machine the combination with ya carriage for carrying a saw, such carriage being movable in a curved path concentric to a central point and adjustable from one angular position to anotheiyot a track belovi7 the carriage and concentric to the path VofV the carriage, a member above the carriage, means pivoting the carriage Y and rigidly uniting the member to the track,

and means whereby the carriage is rigidly .held by expansive force between the topV member and track. 1 Y

6. In a mitering machine the combination with a radial sawA carriage movable. in a curved path from one angular cutting posirigid horizontal track for supporting the `carriage from beneath such track being curved concentrically to the path travelled by the saw and its carriage while being moved from one `angular position to another, and a member above the carriage and rigidly secured to the track, Vand an expansive spring pin carried by the carriage and exerting pressure on the upper member'and forcing the carriage down onto the track. Y

7. In a mitering machine a carriage, a bracing member nabove the carriage, a track upon which theV carriage travels, means securing the bracing member and track in rigid relation, a relatively long vertical pin carried within a relatively long socket in the carriage, such socket having an open top, a

Vrelatively long expansible helical spring within the pin and bearing at its lower end on the carriage for causing the pin to engage anyone 0i a series ot sockets 11i-the bracing 1nember, and means for withdrawing the pin from the socket. Y

8. In a mitering machine the combination with a table, a fixed means for determining the depth ot' the cut with relation to the table7 a saw frame, aV blade, the saw blade having at each end a vertical series of horizontal holes and the respective trame members having series ot' holes dill'erently spaced from the spacing between the holes Vin the ends of the saw blade and means for securing the blade through thev registering holes of the respective related series, immovably in the slots. Y

In testimony whereof we have signed our names to this specification.

yGEORGE o. EDWARDS.

LEVANDER BROWN, JR. 

